Web version deployment

The API is currently deployed on heroku
web build is yarn workspace @solve/client web:build → expo build:web
It makes sense to separate the deployments of server and web app
web app can be hosted on another heroku instance or on vercel (need to reed how)
it would make sense actually to use github-actions to push to heroku, there's a solution for that called akhileshns/heroku-deploy
- not sure how it does it, maybe still pushes all the code to heroku and only directs it to the right Procfile
- maybe it's fine, but we need to also build it on heroku (takes about 2 min and ALL the possible dependencies)
- need to figure out how to show the path to static files and serve them (has to be some heroku setting). Currently the artifacts are in packages/client/web-build
- env.API_URL should be set correctly, and also everything that the auth flow is using (some API keys)

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